[PATCH 1/6] create wrappers for converting kuid_t to/from uid_t

Dwight Engen
2013-06-28T15:11:14Z

Signed-off-by: Dwight Engen <dwight.engen@oracle.com>
---
fs/xfs/xfs_linux.h | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)

diff --git a/fs/xfs/xfs_linux.h b/fs/xfs/xfs_linux.h
index 800f896..761e4c0 100644
--- a/fs/xfs/xfs_linux.h
+++ b/fs/xfs/xfs_linux.h
@@ -159,6 +159,32 @@
#define MAX(a,b) (max(a,b))
#define howmany(x, y) (((x)+((y)-1))/(y))

+/* Kernel uid/gid conversion. These are used to convert to/from the on disk
+ * uid_t/gid_t types to the kuid_t/kgid_t types that the kernel uses internally.
+ * The conversion here is type only, the value will remain the same since we
+ * are converting to the init_user_ns. The uid is later mapped to a particular
+ * user namespace value when crossing the kernel/user boundary.
+ */
+static inline __uint32_t xfs_kuid_to_uid(kuid_t uid)
+{
+ return from_kuid(&init_user_ns, uid);
+}
+
+static inline kuid_t xfs_uid_to_kuid(__uint32_t uid)
+{
+ return make_kuid(&init_user_ns, uid);
+}
+
+static inline __uint32_t xfs_kgid_to_gid(kgid_t gid)
+{
+ return from_kgid(&init_user_ns, gid);
+}
+
+static inline kgid_t xfs_gid_to_kgid(__uint32_t gid)
+{
+ return make_kgid(&init_user_ns, gid);
+}
+
/*
* Various platform dependent calls that don't fit anywhere else
*/
--
1.8.1.4